A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results were as follows:
32 said they drove alone.
33 rode in a carpool.
35 rode public transportation.
9 used both carpools and public transportation.
9 used both a carpool and sometimes their own cars.
9 used buses as well as their own cars.
4 used all three methods.
How many used none of the above-mentioned means of transportation?
To find out how many students used none of the mentioned means of transportation, we need to subtract the total number of students who used any of the mentioned means of transportation from the total number of students in the poll.
First, let's calculate the total number of students who used any of the mentioned means of transportation:
Students who drove alone = 32
Students who rode in a carpool = 33
Students who rode public transportation = 35
Students who used both carpools and public transportation = 9
Students who used both a carpool and sometimes their own cars = 9
Students who used buses as well as their own cars = 9
Students who used all three methods = 4
Total = 32 + 33 + 35 + 9 + 9 + 9 + 4 = 131
Now, let's calculate the number of students who used none of the mentioned means of transportation:
Total number of students in the poll = 100
Number of students who used none of the mentioned means of transportation = Total number of students in the poll - Total number of students who used any of the mentioned means of transportation
= 100 - 131
Therefore, the number of students who used none of the mentioned means of transportation is -31. However, since it is not possible to have a negative number of students, we can conclude that there was an error in the data provided. Please double-check the values given in the poll to get an accurate answer.